LED light bulb with segmented LED filament

Abstract

An LED light bulb having a bulb base and a bulb shell connected with the bulb base, the bulb shell having a layer of luminescent material formed in the material of the bulb shell. A stem with a stand extending to the center of the bulb shell is disposed in the bulb shell. A flexible LED filament is disposed in the bulb shell, at least half of the LED filament is disposed around a center axle of the LED light bulb, where the center axle is coaxial with the axle of the stand and two conductive supports, each of which are connected with the stem and the LED filament. A driving circuit is electrically connected with the two conductive supports and the bulb base. Additionally, a plurality of supporting arms has two ends, with one end connected to the stem and the other end connected to the LED filament.

What is claimed is: 
     
       1. An LED light bulb, consisting of:
 a bulb shell, including a layer of luminescent material integrally formed in the material of the bulb shell; 
 a bulb base, connected with the bulb shell; 
 a stem with a stand extending to a center of the bulb shell, disposed in the bulb shell; 
 a flexible LED filament disposed in the bulb shell, at least a half of the flexible LED filament is around a center axis of the LED light bulb, where the center axis of the LED light bulb is coaxial with the axis of the stand, the flexible LED filament comprising: 
 a plurality of LED sections, each of the LED sections include at least two LED chips, and the LED chips in each of the LED sections are electrically connected to each other through a wire; 
 a plurality of conductive sections, located between two adjacent LED sections and electrically connected with the two adjacent LED sections, where the conductive section comprises a wavy convex structure, encirclingly disposed on a surface of the conductive section along the axial direction of the flexible LED filament; 
 two conductive electrodes, disposed on the flexible LED filament correspondingly and electrically connected to each of the LED sections; 
 a light conversion layer, covering the LED sections, the conductive sections and at least a part of each of the two conductive electrodes, such that each of the two electrodes is partially exposed respectively; and 
 two conductive supports, each of the two conductive supports connected with the stem and the flexible LED filament; 
 a driving circuit, electrically connected with both the two conductive supports and the bulb base; and 
 a plurality of supporting arms respectively comprising two ends, an end of each of the supporting arm is connected to the stem and another end of each of the supporting arm is connected to the flexible LED filament; 
 wherein anodes of LED sections are electrically connected together to serve as a first positive electrode P 1  and/or a second positive electrode P 2  of the flexible LED filament, cathodes of LED section serve as a first negative electrode N 1  and/or a second negative electrode N 2 , respectively, where the positive electrode P 1  and/or the second positive electrode P 2 , the first negative electrode N 1  and/or the second negative electrode N 2  are separately electrically connected to the driving circuit through the conductive supports. 
 
     
     
       2. The LED light bulb according to  claim 1 , wherein spacing between any two LED chips separately disposed in two different LED sections is greater than spacing between any two adjacent LED chips in a single LED section. 
     
     
       3. The LED light bulb according to  claim 2 , wherein each of the conductive section includes a conductor connecting the LED sections, and length of the wire being less than that of the conductor. 
     
     
       4. The LED light bulb according to  claim 3 , further comprising an auxiliary strip covered by the light conversion layer and arranged crossing the conductive section and extending along the axial direction of the flexible LED filament. 
     
     
       5. The LED light bulb according to  claim 4 , wherein the auxiliary strip is arranged cross both of the LED section and the conductive section. 
     
     
       6. The LED light bulb according to  claim 3 , further comprising an auxiliary strip disposed in a region corresponding to each of the conductive sections. 
     
     
       7. The LED light bulb according to  claim 6 , wherein each of the auxiliary strips extends through the corresponding conductive section and extends toward to adjacent LED sections along the axial direction of the LED filament. 
     
     
       8. The LED light bulb according to  claim 7 , wherein the conductor is made of metal coating or in conductive strip form. 
     
     
       9. The LED light bulb according to  claim 8 , wherein the light conversion layer comprises a plurality of particles, and any properties of the structure, material, effect or distribution density of the plurality of particles are different between the corresponding regions of the LED section and the conductive section. 
     
     
       10. The LED light bulb according to  claim 9 , wherein the light conversion layer corresponding to the conductive section comprises a plurality of light conducting particles. 
     
     
       11. The LED light bulb according to  claim 10 , wherein the plurality of light conducting particles are made of different sizes of the polymethyl methacrylate (PMMA) or resin. 
     
     
       12. The LED light bulb according to  claim 11 , wherein the positive electrode P 1  of the LED filament is electrically connected to a first output terminal of the driving circuit, where the first and second negative electrodes N 1 , N 2  of the flexible LED filament are electrically connected together and jointly electrically connected to a second output terminal of the driving circuit. 
     
     
       13. The LED light bulb according to  claim 11 , wherein the positive electrode P 1  of the flexible LED filament is electrically connected to a first output terminal of the driving circuit, the first negative electrode N 1  of the flexible LED filament is electrically connected to a second output terminal of the driving circuit, and the second negative electrode N 2  of the flexible LED filament electrically connected to a third output terminal of the driving circuit. 
     
     
       14. The LED light bulb according to  claim 13 , wherein the second and third output terminals of the driving circuit can be electrically connected together through a resistor and either of the second and third output terminals of the driving circuit is electrically connected to a ground terminal. 
     
     
       15. The LED light bulb according to  claim 11 , wherein the first positive electrode P 1  and the second positive electrode P 2  of the flexible LED filament are electrically connected together and jointly electrically connected to a first output terminal of the driving circuit, the negative electrode N 1  of the flexible LED filament is electrically connected to a second output terminal of the driving circuit. 
     
     
       16. The LED light bulb according to  claim 11 , wherein the positive electrode P 1  of the flexible LED filament is electrically connected to a first output terminal of the driving circuit, the second positive electrode P 2  of the flexible LED filament is electrically connected to a second output terminal of the driving circuit, and the negative electrode N 1  of the flexible LED filament is electrically connected to a third output terminal of the driving circuit. 
     
     
       17. The LED light bulb according to  claim 11 , wherein the first positive electrode P 1  and the second positive electrode P 2  of the flexible LED filament are electrically connected together and jointly electrically connected to a first output terminal of the driving circuit, the first negative electrode N 1  and the second negative electrode N 2  of the flexible LED filament are electrically connected together and electrically connected to a second output terminal of the driving circuit. 
     
     
       18. The LED light bulb according to  claim 11 , wherein the first positive electrode P 1  and the second positive electrode P 2  of the flexible LED filament are electrically connected together and jointly electrically connected to a first output terminal of the driving circuit, the first negative electrode N 1  of the flexible LED filament is electrically connected to a second output terminal of the driving circuit, and the second negative electrode N 2  of the flexible LED filament is electrically connected to a third output terminal of the driving circuit. 
     
     
       19. The LED light bulb according to  claim 18 , wherein a spectral distribution of the LED light bulb is mainly between a wavelength range of about 400 nm to 800 nm, where there are three peak wavelengths P 1 , P 2 , P 3  in wavelength ranges corresponding to the light emitted by the LED light bulb, the wavelength of the peak value P 1  is between about 430 nm and 480 nm, the wavelength of the peak value P 2  is between about 580 nm and 620 nm, and the wavelength of the peak value peak P 3  is between about 680 nm and 750 nm, a light intensity of the peak P 1  is less than that of the peak P 2 , and the light intensity of the peak P 2  is less than a light intensity of the peak P 3 . 
     
     
       20. The LED light bulb according to  claim 19 , wherein points of the flexible LED filament in an xyz coordinates are defined as X, Y, and Z and satisfy a curve equation, an origin of xyz coordinates is at the stem top, an x-y plane of the xyz coordinates passes through a top of the stem and is perpendicular to the height direction, a z-axis of xyz coordinates is coaxial with stem, and the two conductive electrodes are symmetrically disposed at two sides of a y-axis of the xyz coordinates, the curve equation is:
     X=m 1*cos( t* 360), 
     Y=m 2*sin( t* 360), 
     Z=n *cos( t* 360* k ), 
 wherein, t is a variable between 0 and 1, the flexible LED filament varies along an x-direction, a y-direction, and a z-direction according to t; wherein, when X=0, a max value of |Y| is m2, and a max value of |Z| is n; wherein, when Y=0, a max value of |X| is m1, and a max value of |Z| is n; wherein, when Z=0, a max value of |X| is m1, and a max value of |Y| is m2; wherein m1 is a length in the x-direction, m2 is a length in the y-direction, n is a height of a highest point from the x-y plane in the z-direction, and k is a number of the highest point.